Preparation and Microwave Absorption Properties of LiZn Ferrite

Li(0.35)Zn(0.3)Fe(2.35)O(4) ferrite powder was prepared by Sol-Gel method. The electromagnetic parameters epsilon(r)(epsilon(r) = epsilon' -j epsilon '') and mu(r) (mu(r) = mu' -j mu '') in 2 - 18GHz band of the products were tested by HP 8722ES vector network analyzer. Microwave absorbing capability is simulated on the basis of transmission line theory. The result shows that the reflection loss decreases with the increase of thickness(d). When the thickness is 4mm, the absorption curve shows two absorption peaks. When the thickness is 5 mm, the absorption peak is located at 4.4GHz, the reflection loss is -19.96dB, and the absorption band of less than -10dB is from 2.8GHz to 9.0GHz with the bandwidth of 6.2GHz. Microwave absorbing capability is good in low frequency range.